FPC reverse folding tool
The FPC reverse bending tool addresses the issue of popping during production by incorporating a raised tab to securely bond the FPC edge with the steel piece, enhancing production quality and yield.
Patent Information
- Application Number
- CN202421715410.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the prior art, when the FPC is folded, the thickness of the steel sheet exceeds 0.2mm, which leads to a rebound phenomenon, affecting the product pass rate and yield.
A FPC reverse folding tool is designed, including a steel sheet reinforcement layer, an FPC reinforcement film layer and an FPC layer. By setting a boss on the back of the FPC layer to bond the back of the edge material area, the boss is used to bond the edge material and the edge material back adhesive when pressed to avoid rebound.
It effectively solves the rebound problem during FPC reversal, improves the product's pass rate and yield, and achieves a stable reversal effect.
Smart Images
Figure CN223110237U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of FPC tooling, in particular to an FPC folding-back tooling. Background Art
[0002] With the rapid development of devices such as tablets and mobile phones, various electronic devices are widely used in daily life. As an extremely important electronic component in electronic products, the display board has also attracted wide attention in the industry. Among them, the flexible printed circuit (FPC), also known as the flexible circuit board, flexible printed circuit board, flexible circuit board, and soft board, is widely used in electronic products such as mobile phones, laptop computers, PDAs, digital cameras, and LCMs due to its high wiring density, light weight, and thin thickness. Generally, the display board needs to be connected to the FPC board. During production, the FPC board usually needs to be bent first and then pasted on the back of the display board.
[0003] In the prior art, for some products, the requirement for steel sheet reinforcement is relatively high, and the thickness exceeds 0.2 mm. At this time, an obvious height difference is formed between the side of the FPC and the steel sheet, that is, the position with the steel sheet is too high, resulting in rebound during the folding-back processing and production, which affects the qualification rate of the product. Summary of the Utility Model
[0004] The utility model aims to overcome at least one defect of the above prior art, and provides an FPC folding-back tooling to achieve the purpose of better folding-back effect and no rebound.
[0005] The utility model provides an FPC folding-back tooling, which is arranged on a board-taking pallet. A corresponding groove is arranged in the board-taking pallet for facilitating the fixation of the FPC folding-back tooling. The tooling includes a steel sheet reinforcement layer, an FPC reinforcement film layer, and an FPC layer. The steel sheet reinforcement layer, the FPC reinforcement film layer, and the FPC layer are sequentially laminated to form a tooling board. The thickness of the steel sheet reinforcement layer > 0.2 mm. The tooling board includes a functional area in the middle and a side material area. A convex platform is arranged on the back of the FPC layer. When the tooling is folding-back and false-pressing, the edge of the side material area is adhered to the convex platform to avoid rebound.
[0006] After testing, when the thickness of the steel sheet exceeds 0.2 mm, if the steel sheet thickness is designed according to the conventional tooling for a 0.2 mm thickness design, rebound occurs during the reverse folding process. That is, a significant height difference is formed between the edge material and the position where the steel sheet is attached. The position with the steel sheet is too high, and the edge materials do not adhere to the pure glue during the false pressing, making it easy to bounce back and cause poor reverse folding and rebound, resulting in unsmooth production of the product, a high defect rate, a low yield rate, and inability to mass-produce. Therefore, it is necessary to change the design of the reverse folding tooling to improve the position of the non-steel sheet inside or outside the effective area of the product. The tooling of the present utility model adds a design of a boss, which first solves the problem that after the product is reverse folded, the back of the FPC adheres to the pure glue. That is, the back glue of the edge materials is forced and extruded by the boss of the tooling during false pressing, making them adhere together and solving the rebound problem.
[0007] Preferably, the height difference between the upper surface of the boss and the upper surface of the plate-taking support plate is 0.5 mm. The height of the boss is 2.5 - 3 mm.
[0008] More preferably, the height of the boss is 2.5 mm.
[0009] For the convenience of reverse folding and pasting and fixing of the FPC board, a back glue layer is provided on the edge material area of the present utility model, and the reverse folding of the edge material area is adhesively fixed to the boss through the back glue layer.
[0010] Preferably, the FPC reinforcing film layer includes an epoxy adhesive film and a pressure-sensitive film coating. There is also a glue paper between the FPC reinforcing film layer and the FPC layer. The FPC layer is fixed to the FPC reinforcing film layer through the glue paper.
[0011] Furthermore, during the false pressing of the reverse folding of the tooling, the position of the non-steel sheet is outside the effective area of the product, that is, a 0.35 mm space is set in the edge material area. If it is too long, it will result in too large a volume and require edge trimming. If it is too short, reverse folding is prone to rebound.
[0012] Preferably, a first groove is provided in the middle of the pressure-sensitive film coating, a second groove is provided in the middle of the epoxy adhesive film, and the steel sheet reinforcing layer is embedded in the second groove.
[0013] Compared with the prior art, the beneficial effects of the present utility model are:
[0014] The tooling of the present utility model adds a design of a boss, which first solves the problem that after the product is reverse folded, the back of the FPC adheres to the pure glue. That is, the back glue of the edge materials is forced and extruded by the boss of the tooling during false pressing, making them adhere together and solving the rebound problem. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the disassembled structure of the FPC reverse folding tooling of the present utility model.
[0016] Figure 2 This is a structural schematic diagram after the folding of the FPC folding tooling of the present utility model. Specific embodiments
[0017] The accompanying drawings in the embodiments are used to describe the technical solutions in the embodiments of the present utility model in more detail. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present utility model. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model. The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
[0018] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.
[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.
[0020] Embodiment
[0021] The present utility model provides an FPC folding tooling, as Figures 1 - 2As shown in the figure, it includes a steel sheet reinforcement layer 1, an epoxy film 2, a pressure-sensitive film coating 3, and an FPC layer 5. The steel sheet reinforcement layer 1, the epoxy film 2, the pressure-sensitive film coating 3, and the FPC layer 5 are laminated to form a tooling board and placed on a plate-taking support board 7; a sticker 4 can also be provided on the back of the FPC layer 5. The thickness of the steel sheet reinforcement layer 1 is 0.6 mm; in another embodiment of the present invention, an FPC layer is also provided above the steel sheet reinforcement layer 1; the tooling board includes a functional area 10 in the middle and a side material area 20 with a width of 0.35 mm; a boss 6 with a height of 2.5 mm is provided on the back of the FPC layer 5, and the height difference between the boss 6 and the plate-taking support board 7 is 0.5 mm. When the tooling is in reverse folding and false pressing, the edge of the side material area 20 is adhered to the boss 6 to avoid rebound.
[0022] In order to facilitate the reverse folding and pasting fixation of the FPC board, a back glue layer is provided on the side material area 20 of the present invention, and the side material area 20 is reversely folded and adhered and fixed to the boss 6 through the back glue layer.
[0023] Preferably, a first groove 30 is provided in the middle of the pressure-sensitive film coating 3, a second groove 40 is provided in the middle of the epoxy film 2, and the steel sheet reinforcement layer 1 is embedded in the second groove 40.
[0024] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention. Those skilled in the art can also make other changes within the spirit of the present invention for use in the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made in accordance with the spirit of the present invention should all be included within the scope claimed by the present invention.
Claims
1. An FPC folding tooling, which is arranged above the board taking and supporting plate (7), is characterized in that, It includes a steel sheet reinforcing layer (1), an FPC reinforcing film layer, and an FPC layer (5). The steel sheet reinforcing layer (1), the FPC reinforcing film layer, and the FPC layer (5) are sequentially laminated to form a tooling board; The thickness of the steel sheet reinforcing layer (1) > 0.2 mm; The tooling board includes a functional area (10) in the middle and a scrap area (20); A boss (6) is provided on the back of the FPC layer (5). When the tooling is folded back and false-pressed, the edge of the scrap area (20) adheres to the boss (6) to prevent rebound.
2. The FPC folding tooling according to claim 1, characterized in that, The height of the boss (6) is 0.5 mm higher than that of the board-taking pallet (7) board-taking pallet (7) board-taking pallet (7).
3. The FPC folding-back tooling according to claim 2, wherein, The height of the boss (6) is 2.5 mm.
4. The FPC folding-back tooling according to claim 1, wherein A pressure-sensitive adhesive layer is provided on the scrap area (20). The scrap area (20) is folded back and adhered to the boss (6) through the pressure-sensitive adhesive layer for fixation.
5. The FPC folding-back tooling according to any one of claims 1 to 4, characterized in that The FPC reinforcing film layer includes an epoxy adhesive film (2) and a pressure-sensitive film coating (3).
6. The FPC folding-back tooling according to any one of claims 1 to 4, characterized in that The width of the scrap area (20) is 0.35 mm.
7. The FPC folding-back tooling according to any one of claims 1 to 4, characterized in that, A sticker (4) is also provided between the FPC reinforcing film layer and the FPC layer (5).
8. The FPC folding-back tooling according to claim 5, wherein A first groove (30) is provided in the middle of the pressure-sensitive film coating (3), a second groove (40) is provided in the middle of the epoxy adhesive film (2), and the steel sheet reinforcing layer (1) is embedded in the second groove (40).